<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
    </head>
    <body>
        <form action="/test_cgi" method="POST">
            data_x:
            <input type="text" name="data_x" value="0">
            <br>
            data_y:
            <input type="text" name="data_y" value="0">
            <br><br>
            <input type="submit" value="提交">
        </form> 
        <button type="button" onclick="alert('Hello World!')">点击我！</button>
        <p>如果您点击提交，表单数据会提交给test_cgi进行后台数据处理！</p>
    </body>
</html>